<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <!-- <div class="button">{{this.$store.state.city}}</div> -->
                        <div class="button">{{this.currentCity}}</div>
                        
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" v-for="item of hot" :key="item.id"
                        @click="handleCityClick(item.name)"
                    >
                        <div class="button">{{item.name}}</div>
                        
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id"
                     @click="handleCityClick(innerItem.name)"
                    >
                        {{innerItem.name}}
                    </div>
                </div>
                
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'

    export default {
        name:"CityHeader",
        data() {
            return {
             
            }
        },
        methods: {
            handleCityClick(city){
                // this.$store.dispatch("changeCity",city)
                // this.$store.commit("changeCity",city)
                this.changeCity(city)
                this.$router.push('/')
            },
            ...mapMutations(['changeCity'])
        },
        computed: {
          ...mapState({
              currentCity:'city'
          })
          //...mapState把这个组件的东西映射到computed里
          //这个city则是把 city映射到city计算属性中
        },
        mounted() {
            this.scroll = new Bscroll(this.$refs.wrapper)
        },
        props:{
            hot:Array,
            cities:Object,
            letter:String
        },
        watch:{
            letter(){
                if(this.letter){
                    const element = this.$refs[this.letter][0] //这里resfs获得的是数组所以加[0]
                    this.scroll.scrollToElement(element)
                }
            }
        },
        
    }
</script>

<style lang="stylus" scoped>
@import '~@style/varibles.styl'
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc
    .border-topbottom
        &:before
            border-color #ccc
.list 
        z-index -1
        overflow hidden
        position absolute
        top 1.58rem
        left 0
        bottom 0
        right 0
    .title
        line-height .54rem
        background #eee
        padding-left .2rem
        color #666 
        font-size .26rem
    .button-list 
        overflow hidden
        padding 0.1rem .6rem .1rem .1rem
        .button-wrapper
            float left
            width 33.3%
            .button 
                margin .1rem
                padding .1rem 0  
                text-align center
                border .02rem solid #ccc
                border-radius .06rem
    .item-list 
        .item 
            line-height .72rem 
            color #666 
            padding-left .2rem
</style>